Over the past 110 years, 93 423 girls and 1 494 boys have been named Kay. The name Kay ranks 357th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kay in 1910. The peak of popularity of the name Kay came in the 1930s and 1940s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.